Like you, I am not sure where the confusion is here, but I have a good guess...

May 1st 2011, 08:10 PM

jzellt

You're right... Thanks. This is a propostion right out of my professors lecture notes and I was asked to prove it. I guess he made a mistake... Thanks again

May 1st 2011, 08:15 PM

jzellt

In my professor lecture notes, he states:
The following says that trapezoids (defined using the American convention, as opposed to
the British convention) are regular.
Then, the proposition is stated. So I guess I still need a proof the proposition posted in my original post...

May 2nd 2011, 02:56 PM

bjhopper

Hello jzellt,
To define a regular trapezoid or a parallelogram something more than two parallel lines is required. For example the two parallel line segments are equal . you must be leaving something out